﻿    $.extend($.fn.datagrid.methods, {
        autoMergeCells: function (jq, fields) {
            return jq.each(function () {
                var target = $(this);
                if (!fields) {
                    fields = target.datagrid("getColumnFields");
                }
                var rows = target.datagrid("getRows");
                var i = 0,
                j = 0,
                temp = {};
                for (i; i < rows.length; i++) {
                    var row = rows[i];
                    j = 0;
                    for (j; j < fields.length; j++) {
                        var field = fields[j];
                        var tf = temp[field];
                        if (!tf) {
                            tf = temp[field] = {};
                            tf[row[field]] = [i];
                        } else {
                            var tfv = tf[row[field]];
                            if (tfv) {
                                tfv.push(i);
                            } else {
                                tfv = tf[row[field]] = [i];
                            }
                        }
                    }
                }
                $.each(temp, function (field, colunm) {
                    $.each(colunm, function () {
                        var group = this;

                        if (group.length > 1) {
                            var before,
                            after,
                            megerIndex = group[0];
                            for (var i = 0; i < group.length; i++) {
                                before = group[i];
                                after = group[i + 1];
                                if (after && (after - before) == 1) {
                                    continue;
                                }
                                var rowspan = before - megerIndex + 1;
                                if (rowspan > 1) {
                                    target.datagrid('mergeCells', {
                                        index: megerIndex,
                                        field: field,
                                        rowspan: rowspan
                                    });
                                }
                                if (after && (after - before) != 1) {
                                    megerIndex = after;
                                }
                            }
                        }
                    });
                });
            });
        }
    });